Palladium(II) Complex Bearing a Pyrazolyl-1,2,3-Triazolyl Hybrid Ligand for C-H Bond Activation Toward N-Substituted Carbazole Synthesis

Abstract

A convenient phosphine-free strategy for synthesizing Nsubstituted carbazoles via C-H activation using a novel pyrazolyl-1,2,3-triazolyl Pd(II)-complex is described. Dual C-N bond formation from 2-iodobiphenyls and amines affords carbazoles in good yields. Notably, benzenesulfonamides and aliphatic amines act as coupling partners, a transformation not reported earlier. The complex was confirmed by singlecrystal X-ray diffraction.